Evolutionists have often asserted that evolutionary change is irreversible. In fact, that assertion has the status of a law, called Dollo’s Law. However, a search of the literature shows that the evolutionists are being forced more and more to admit that, according to their presuppositions, there have been reversals. Once that admission is made, attempts to resolve the order of strata by supposed evolutionary changes in fossils become very questionable. The matter of reversals in the fossil record is an unreported controversy among paleontologists. Even the minority of paleontologists who recognize the fossil evidence for reversals are very obtuse regarding the implications in stratigraphy and phylogeny, both of which have been developed on the concept of the irreversible nature of the fossil record and of evolution.